HBase常见问题

问题1：启动Hbase时出现如下的信息，说明HBase中的slf4j-log4j12-1.7.25.jar和Hadoop中的slf4j-log4j12-1.7.10.jar冲突。

[root@localhost ~]# start-hbase.sh
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/root/trainings/hbase-2.0.1/lib/slf4j-log4j12-1.7.25.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/root/trainings/hadoop-2.7.3/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]

解决方案：

step1：将HBase下的新版本slf4j-log4j12-1.7.25.jar替换Hadoop目录下的旧版本slf4j-log4j12-1.7.10.jar；

[root@localhost ~]# rm -f /root/trainings/hadoop-2.7.3/share/hadoop/common/lib/slf4j-log4j12-1.7.10.jar
[root@localhost ~]# cp /root/trainings/hbase-2.0.1/lib/slf4j-log4j12-1.7.25.jar
/root/trainings/hadoop-2.7.3/share/hadoop/common/lib/

step2：删除HBase中的新版本slf4j-log4j12-1.7.25.jar原始文件；

[root@localhost ~]# rm -f /root/trainings/hbase-2.0.1/lib/slf4j-log4j12-1.7.25.jar

step3：在HBase中新建一个名为slf4j-log4j12-1.7.25.jar软连接文件，指向Hadoop中的slf4j-log4j12-1.7.25.jar。

[root@localhost ~]# ln -s /root/trainings/hadoop-2.7.3/share/hadoop/common/lib/slf4j-log4j12-1.7.25.jar
/root/trainings/hbase-2.0.1/lib/slf4j-log4j12-1.7.25.jar

问题2：停止HBase时，出现长时间无法停止的情况

[root@localhost logs]# stop-hbase.sh
stopping hbase......................................................................
....................................................................................
....................................................................................
....................................................................................
............................^C

解决办法:【权宜之计】Ctrl + C杀掉任务，再执行一遍即可

[root@localhost ~]# stop-hbase.sh
stopping hbase.........
localhost: running zookeeper, logging to /root/trainings/hbase-2.0.1/bin/../logs/hbase-root-zookeeper-localhost.out
localhost: stopping zookeeper.

终极解决办法：将hbase-env.sh中的HBASE_MANAGES_ZK置为true：

[root@localhost ~]# vim /root/trainings/hbase-2.0.1/conf/hbase-env.sh
# Tell HBase whether it should manage it's own instance of ZooKeeper or not.
export HBASE_MANAGES_ZK=true

[root@localhost ~]# stop-hbase.sh
stopping hbase............................
localhost: running zookeeper, logging to /root/trainings/hbase-2.0.1/bin/../logs/hbase-root-zookeeper-localhost.out
localhost: stopping zookeeper.

问题3：进入hbase shell时，报错无法加载native-hadoop库文件

[root@localhost ~]# hbase shell
2018-07-25 21:42:26,023 WARN [main] util.NativeCodeLoader: Unable to load native-hadoop library
for your platform... using builtin-java classes where applicable
HBase Shell
Use "help" to get list of supported commands.
Use "exit" to quit this interactive shell.
Version 2.0.1, r987f7b6d37c2fcacc942cc66e5c5122aba8fdfbe, Wed Jun 13 12:03:55 PDT 2018
Took 0.0016 seconds
hbase(main):001:0>

问题4：启动HBase时出现如下信息，说明ZooKeeper已经启动了，因为HBase会自动启动ZooKeeper，所以不用事先单独启动ZooKeeper。

[root@localhost ~]# start-hbase.sh
localhost: running zookeeper, logging to /root/trainings/hbase-2.0.1/bin/../logs/hbase-root-zookeeper-localhost.out
localhost: java.net.BindException: 地址已在使用
localhost: at sun.nio.ch.Net.bind0(Native Method)
localhost: at sun.nio.ch.Net.bind(Net.java:433)
localhost: at sun.nio.ch.Net.bind(Net.java:425)
localhost: at sun.nio.ch.ServerSocketChannelImpl.bind(ServerSocketChannelImpl.java:223)
localhost: at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:74)
localhost: at sun.nio.ch.ServerSocketAdaptor.bind(ServerSocketAdaptor.java:67)
localhost: at org.apache.zookeeper.server.NIOServerCnxnFactory.configure(NIOServerCnxnFactory.java:90)
localhost: at org.apache.zookeeper.server.ZooKeeperServerMain.runFromConfig(ZooKeeperServerMain.java:117)
localhost: at org.apache.hadoop.hbase.zookeeper.HQuorumPeer.runZKServer(HQuorumPeer.java:94)
running master, logging to /root/trainings/hbase-2.0.1/logs/hbase-root-master-localhost.out
: running regionserver, logging to /root/trainings/hbase-2.0.1/logs/hbase-root-regionserver-localhost.out

解决办法：启动HBase之前不要手动启动ZooKeeper

[root@localhost ~]# zkServer.sh stop
ZooKeeper JMX enabled by default
Using config: /root/trainings/zookeeper-3.4.10/bin/../conf/zoo.cfg
Stopping zookeeper ... STOPPED
[root@localhost ~]# start-hbase.sh
localhost: running zookeeper, logging to /root/trainings/hbase-2.0.1/bin/../logs/hbase-root-zookeeper-localhost.out
running master, logging to /root/trainings/hbase-2.0.1/logs/hbase-root-master-localhost.out
: running regionserver, logging to /root/trainings/hbase-2.0.1/logs/hbase-root-regionserver-localhost.out